Eoasting fuenace



(No Model.) 3 Sheets-Sheet 1.

A. ROPP. ROASTING FURNACE.

No. 532,013. Patented Jan. 1, 1895.

(No Model.) 3 Sheets-Sheet 2.

A. ROPP.

ROASTING FURNACE.

N0. 532,013. Patented Jan. 1, 1895.

(No Model;) 3 Sheets-Sheet 8; A. ROPP.

ROASTING FURNACE. No. 532,013. Patented Jan. 1, 1895.

to the furnace at each end UNITED Srn'ras ALFRED ROPP, OF SAN FRANCISCO, CALIFORNIA.

ROASTlNG-FURNACE.

SPECIFICATION forming part of Letters Patent No. 582,013, dated January 1, 1895.

P -fi filed February 19,1594. Serial No. 500,754. (110 model.) I

To all whom it may concern.-

Be it known that I, ALFRED ROPP, a citizen of the United States, residing in the city and county of San Francisco, State of California, have invented an Improvement in Roasting- Furnaces; and I hereby declare the following to be a full, clear, and exact description of the same.

My invention relates to an improvement in furnaces for roasting ores.

It consists essentially in a novel means for stirring and advancing the ore through the furnace.

Referring to the accompanying drawings for a more complete explanation of my invention,-Figure 1 is a transverse vertical section through m-a: of Fig. 2. Fig. 2 is a horizontal section through 10-20 of Fig. 1. Fig. 3 is a transverse vertical section through y-y of Fig. 2. Fig. 4 is a transverse'vertical sec tion through z-z of Fig. 2. Fig. 5 is a longitudinal vertical section on line 5-5 Fig. 4.

A represents the roasting chamber having a hearth B and an arched top C. The hearth B has a central longitudinal channel D made through it as shown. In the present case the hearth proper is supported upon suitable iron or other plates B which are turned upwardly in the center leaving a narrow channel between them, the height being suiiicient to prevent the ore from falling down through this channel.

Beneath the furnace is an open chamber E, within which a four wheeled truck F is adapted to travel one pair of wheels being exposed and the other shown by dotted lines in Fig. 2. From this truck an arm G extends upwardly through the channel or s ot in the hearth, and across its upper end is asupporting bar 11 from which the rabbles or stirring teeth I project. This truck preferably runs upon tracks in the chamber beneath the furnace, and these tracks are continued exterior pass around in a cnrve'so as to return parallel with the furnace and exterior to it.

.T J are pulleys which serve to guide and also transmit power to a cable K which is at tnched to the car at opposite ends.

'When the car is 'in motion, it is drawn along by the movement of the cable passing beneath the furnace, and by means of the upwardly projecting bar and the rakes carried by it, the ore is stirred and moved along through the furnace at any desired rate of speed. After leaving the furnace the car passes around upon the track exterior to the furnace and during its passage and return to the point of commencementit becomes sum ciently cool and ready to again enter the fun nace.

Each time that the stirring apparatus cu ters the furnace, an automatic mechanism is put into action which delivers a suitable proportion of the raw material into the furnace from a hopper or receptacle above. This mechanism is shown in Figs. 2, 4 and 5 and comprises a shaft M belted to a d riveu shaft M provided with a tappet m which engages 2. lug 0 on the lower side of a slide 0 in the bottom of the hopper O.

The open ends of the furnace may be closed by flexible or swinging doors L of metal, asbestos, or other suitable material so that when the car reaches either of the doors it will be displaced to allow the car to pass and again close after the passage of the car.

I prefer to fill the space in the chamber through which the car travels by a filling E, so to leave only room for the car to pass and thus reduce the amount of air which can enter through this clainber.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. A roasting furnace comprising a roasting chamber having a hearth, a central longitudinal truck or car chamber exteriorto the roasting chamber, the said two chambers being connected by anal-row longitudinal slot, a car or truck traveling in the car or truck chamber and having an armprojectiug vertically through said slot into the roasting chamber, a rake or rabble in the roasting chamber and connected between its ends to said arm whereby it will rake the material on the hearth at both sides of the said slot, substantially as herein described.

2. A roasting furnace comprising a roasting chamber provided with a hearth having a central longitudinal slot, dividing it through its length, a car or truck chamber beneath said hearth and communicating with the roasting chamber through said slot, a track extending through the car or truck chamber and having e return branch exterior thereto, an end I less cable corresponding with the track, a car or truck connected with the said. cable to be drawn thereby around the track, and proided with an arm extending upwardly through the slot into the roasting chamber, and a rake secured between its ends to the upper end of the arm and crossing the slot to rake the material'on the hearth at both sides of he slot, substantially as herein described,

53. In a roasting furnace, an inclosed chamher and hearth, fire-places and means supplying heat t0 the clzcrnber, & central longi- Ludinci chamber situated hence-1h in? nace hearth, a channel extending from said chamber into the furnace and having up" turner sides projecting above the surface oi the hearth, a, car traveling upon within the chamber and having arms projecting ihrcugh the slotted channel, transverse and closed. t are;

or stirrers connected with said arms, and an endless rope oonneczing with opposite ends of the car and following a, continuation of the track exterior to the furnace whereby the car is alternately censerl to traverse the length of the furnace and drag the stirrers through the material contained upon the hearth, and it is thence returned to the starting point exterior to the furnace, chambers situated oeneath the hearth adapted to receive cars into which the cre'is discharged after ithas passed through the f rnece, and doors at opposite ends which em enened auiomatically by the entrance and me me of the stirring devices er herein described.

In'witness whereof LE have hereunto set my ALFRED RUIT. 

